One essential not mentioned yet is a supply of rope. A 50 foot length of parachute cord won't weigh much or take up any room in you pack (great choice of pack by the way) & you'll really be glad you've got it if & when you need it.
I'd suggest a supply of TP and some handiwipes in a zip lock also. Not just for the obvious reasons. TP makes a good trail blazer to mark your trail that deteriorates in case you forget to pick it up when you leave the woods. The and the wipes will come in handy to clean off the blood from your hands after you gut your first deer.
Goose Hunter was right too - the most important thing to have is a good time!